Best tool to tell system info plus temp?

I have KDE. The tool it has, no temp or I couldn’t find it.

Plasma System monitor has the ability to monitor temps and fans.
You may need to add “+ Add a new page” and configure the sensors yourself though.

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To check system sensors (temperatures & fan speeds) in terminal:

sensors

To show system temperatures (and may more things) on desktop:
Conky: Light-weight system monitor for X, Wayland (sort of), and other things, too

forum.manjaro.org - Conky showcase 2024

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How do I config the sensors? That stopped responding so I got Psensors.

As stated above, Conky also fastfetch, neofetch etc.
Best is a matter of opinion. What works for you may not work for everybody else.